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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3f34b0a4281ed9e0c9d33bb7c6bd0300818842a74176d164e77c474343d87c' 
  AND token = 'qqpamdfkFaS7lMnyEJH/VNmiwFySOL/zLwUgB+IGXTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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