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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc67b6ff39d468cc282d45d4747ac41763218826851983e08cc11fa1f3f4e0c1' 
  AND token = 'dSPQC0cXsjfZI9g85Xu4faVUs0LBLroDnWufQ7wegUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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