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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fadc8a0b744f24a7f1693974bf14ef053d3cd453146aa35d9d02d523edc18c21' 
  AND token = 'fQmuwkIfSxAmhP/COvzkcIC/vIIhbx7Kmg02+xSvaaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00898

JSON explain

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