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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d4c85f05bc796e737a3f19afe5a8bf68ba07ee1ff3b4d9334229cf5f4c4156' 
  AND token = 'y+gkUVDbNAtsjq6fpZ5mtglbbg8hrSD4jk4CKZNN6ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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