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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b02105987b75c94ab913f4692d5791dca8f08534cae78a652a0793042db629' 
  AND token = '/N6d+KXPDp1CemHZ0kwY7fgL6cKRE074VTUBNQ275YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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