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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9303cd797c37f09d1f81e3c6d57d7163b3f9a58371e7f047e770d77a7f5846' 
  AND token = 'IaGvD4/WqrvQqX7UhJu3s6ZG5KRw4mtssaufUDHpL7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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