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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a870fa45354845b81b54d1636bd0dc0f319fe27efd626722aff8a396e51cdf' 
  AND token = 'Qgp5rc6NvE2cBFYKwfIrfuG8kMtWnbH+Rc9mbVxc8cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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