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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7a6cf4a2840298253ae170d28a27988bf61e94837b561bebc03b86c92a0f1bee' 
  AND token = 'RTHcxgML2JhUKCX1n+dLnQ10o/PE42uiU7Uz1/olKD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00991

JSON explain

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