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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f781ebe2ef15c0847f47ef794308f845b46202bc2f1377e4ebec20dec6282fbd' 
  AND token = 'n+d2ZcS6ckd46qENUnNv7f44FSm7MtRJ+Iys0hsh4bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00752

JSON explain

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