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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fe2025ee668391c4d8c7d929e12f2cc1efa8decacc7a9bd10830618ea34962d7' 
  AND token = 'hejvqzH61ZHjVJen8YMR9or4CkI2YkHzB1FUvZvnTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00833

JSON explain

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