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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f6676e55d07ef50e5d74c5086b235e63bb123236f40f94450ad3b64851bff127' 
  AND token = 'TN0VWGYDGXnUCT6BGuaDJ6MMhL5NZcYc6DvaL70t5kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00933

JSON explain

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