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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd856120163a1c05f2dcfc52262b3de6a0d7c604a11a8128c1d337d5a65045756' 
  AND token = 'RJjkxtAdk9O2nDkeq85eNVFMmk3dGwO8o/n180q50IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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