SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8b912c2eefd719572316fd23512dc63993efc5094407545590a6c5401298db' 
  AND token = 'twt7LbXSv4LoF8+rlThuRbcH2r/eDjx01oP9JQYq/Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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