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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e52f7370a082539fca3bced18f6a407a6e7e357a91224202270ce3145d7ea4da' 
  AND token = 'kABe1oR/2TW2e++4TIG/Fv2Gcx9MN6n8fMdi2C7EeWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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