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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bb5e27a916e28b35ab198a5a431206baf79b8d1ba0f74abf8b555949a5bd588e' 
  AND token = '7KteeFivbO3DKCDlP6YqM/thyAbBsYOVpc43M2dtexY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00784

JSON explain

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