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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9666a8df0ba86aa34c9dad36afc25205bffd03fe717b7aa0c73394a5f9084b07' 
  AND token = 'u1AF1fE5sV/6FdwDO3XW4tKXzjEXf3Ki9WKMGzSdfrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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