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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e11a032620c9c4487c0c0284c12124120ca01982c489373dea282f570c5dc28a' 
  AND token = 'lD4tJb1pHAo5SznUGQfwGQykYmM5azuPcRelRJMj0tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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