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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e6d464ee4686ac5cc1964649b9ad6ec6c13e2e277bf82cee96f53d02cdfbea' 
  AND token = 'aqkgllWE4lEpiMhDpbO2W9f3A4I7DrNfKLeLiZpRTpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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