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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb65da1336e6cc182e4f609adbcc64e8fde73b6952a59fca42720f131589921' 
  AND token = '6p83ss4BL26k8c3H/1Qg/ii/ByfVs7RN0wteeTQDTl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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