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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91159bac2155e21b819f087db24c299f83cbeac799e0087838875d99c6602799' 
  AND token = 'yPcc52+atcYObRzGWj4QJg4M7Bc6tRIylIYMNPNaDs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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