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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8ff5288bea00e93816651f8ce7807485ec996a0b680a02564c9da8133e392adb' 
  AND token = 'XrHvc87eI2JBKx5s0BVCMfL0ApVT2qkTNxKJxElHFMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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