SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd24271c66ee1392a4df838b1582ec4f914bded4888990033c7b2972f982c58' 
  AND token = 'GO/REKN0ygVCp3QBCadpANnRbayGTKKdzhQFgLWhlJI=' 
  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"
    }
  }
}