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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb1688d727a7d254d772022f3708dac0514013dc7d3893f1da0305b69bd427f' 
  AND token = '2ZhTUBl2l2BR/RH93ynI+NiMhzkeJO01QdTI56upKkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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