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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e462ca2866f4c9674b060b04f21822394157931d1734c9dcda42da4ce4d5dbbd' 
  AND token = '/RCVvkrzeKvA97tNmn8WVX6DByLIL4+AwLefP2Ru4Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00780

JSON explain

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