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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcceb791c12fb2a0aade8a50f6a9f811a2d8ec047e03c282ef538630dfe2c7f3' 
  AND token = 'MfSibrKAb2NWfujUmAu6sUF5/9FTQf8rfxszIhqHVNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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