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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c70cacf9312e056cb9587d5092f386f6ce8c77132399b170649684a07c455c1' 
  AND token = '8OhwFrlDB9SKGVv0IesGpONuAQLFTtCp99sb7g+AIwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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