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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'cad42f04196b9df98979447051819560ddb841ef053141d700c6283ccfde186e' 
  AND token = '9LE6e/+Ad+jmRXnfrvdaL2Ulnp6rb7GT1NnOC+L1NZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00773

JSON explain

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