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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61993e43d0a36eed0a9c2f563fb0164e9a43c315c0cfdc2e3c59bd719367a1d6' 
  AND token = 'nUCvlNl4HpNyKXsQx7tSlcAlzvWf+72NczXXhEC1+6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}