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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c482f0ec27fc8a9e172da1cc5c2393ae4eeb86a5ac818400e177804e8b59cc9' 
  AND token = '1ahpfV1cPXiC65IpqCyzVeisQcrvtULqNqm0gybU5IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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