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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a229949c471b74b317196c8a11ae8d2f939856ddc1c1c985b32668054b5663a' 
  AND token = 'ilqWM/Hc2tBKuHvTINiNhOITj84Ty4G142B/vswYc5I=' 
  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"
    }
  }
}