SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6949ac5aac7b10288f8d632460793f35a1c542bf4280adde85aad7b29fa708' 
  AND token = 'H/BglFozhEKUfqZPGmOQ9Qq+swphad77o635UMhEsgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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