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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '42b6d0d4ac8ce6d7024e01e05eb80b42efa08bc9fac488d9a56091dfcace82ac' 
  AND token = 'sr4oQ4TGF/CVN/X1VT7c78Wf+cwm1UwOAW1HcvLSlS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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