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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e0b37ed732a3af294824868fd533ee885c2b857efec8bbace41f166ab52f61' 
  AND token = '6AGoW7xP+7oJeFCV0FyAEWfAnlC5xn1zANLFV2qRf8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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