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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c93cf650f1e58af2a957b27546d70e8bfe1bd64707d93b23afa0a0659483341' 
  AND token = 'PJJxiRWEWedYtmZZbG9M7aMjSvfjIteZrZQl287WZXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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