Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39168a48ee2c8fd33ef84d2d13b03a600727926d798f307eda215dd114751ac5' 
  AND token = 'kN5QhWWfdaBB66pYGb8lRJRWVD2DjcxfJXQDDtv/Gyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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