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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1bac51591f533dbab41e0d73398f8fd5baf1b4626ba2d22ab4750c52f4e521' 
  AND token = 'XHfhIYwntMLnJuCIQ6enb7QbsltWmjhruRtrb308sZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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