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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb11275c9b113e26cf74433b91ccb34194a4d373f8f82faf838565ac4da19609' 
  AND token = 'js3NBURMYg3ixa4NlU6um28PW3wrPTdC/+LYtCe65SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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