Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284b3e9d13299c9f33e3de514cc9e086af586171e60057fafefc2d9e9e50cbdc' 
  AND token = 'TKHEbMaMgeNm2A3NzZ1h4OhZuwwvM5nbsX/ffPTmp8Q=' 
  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"
    }
  }
}