SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f4d44dec3fb97c941fc08d297168402b8c3c3ebd80ae6b3dec075e68ae0b8d' 
  AND token = 'juBtPJ+XJC0xzciP2T41WhIAhSPivNDg/5IwDtlKXhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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