SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf991beb8c426b9f736b0872b463ad5bb18e2f117a8665314de89a731991129a' 
  AND token = 'AZiSzuWwbpKc4cRDCRhIWgoZWCPHAmdoNMVgs8jhTL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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