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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccda7300b5b1054f731356136e1673f6d299468e509f22747066840e842b92ed' 
  AND token = 'jw9gfzTVWrvc10DLo5sVCOCWoSJPmlMhTTHd66MdMTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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