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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c9c74c43006a7072d96c7077803e20092b25abc936602c0f51350c011fc45cd1' 
  AND token = 'zMi8s1SGnfKWJqAYqTmGu1i9s3IyQCS0uAhGlbc7OGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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