Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f0b7ce3b9f37c4d9a6517f881d5274fb9c3d031b8293efae91bfd19f32ff48fb' 
  AND token = '6eRsQLpj7E+BnLkTHCr4wRKbXAd+onS3Xv7vBl5PLsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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