Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0667d477f1ea131122109786ce4c5cbab19ca7cfdda573ee391123192a99ef' 
  AND token = '8eJ1gWTikzgqfOyqe6ZOOn7z3Gapcgc3DUyzMv1eClQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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