Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '75449d819a078522392867fa70380a2e0eba8320e6040abf4a065a28ecd75c12' 
  AND token = 'E5c9FnGMV3vCzaBbZIjZ3aCGh++rX1onxyAugoPMF7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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