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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25425a0fcfe7d3a6c8763a989c6617818e35002f75b72bf9122ece4041f921a' 
  AND token = 'Jx2ANukrzLOg6d8dPbS/Jz1QO+ZsgJ5jJseB+aDCPi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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