SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957589c7cba8982881d023e23cd1d6ad5a5b716b3077685469486812049ea343' 
  AND token = 'I/j0MjJx5pG+vs/u4nnpgxhxSRrPYoJHTfSy9AP+D3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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