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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af35d960c8872b6d09f9c753a83633b90325e263f7922eaeba5c94fd3f156a1a' 
  AND token = '8lrdT3jwDJxW2+em0c4HPei7CaIdJOkGKEMqie3xg4Y=' 
  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"
    }
  }
}