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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbebcca91ebb0416dcadbc90a2a85f7b4a6671c392db5bc5c058a45f1299459' 
  AND token = 'dFnsfyzq0sgu23xYAY6oS+F0iBki+jvo1uiUt2IFmZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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