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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a7db2e175f1ec384298cffacf74c514f34ab81710136cd2d91ff4d85eb285658' 
  AND token = 'ySVpgq6Lk2tuxKV0VJH+IfEOfs9Zo88ik4msLzXRh4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00754

JSON explain

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