Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5470421d22507dec084f28f7a20ac8c1937a2a28bb28d77a0d9eafb152367a59' 
  AND token = 'OiorXRrWyc1FVGtUfEBlbNJJEUcDjLFZ1Plh1/2ygHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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