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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f330cfa04bd859c30c7c09e01b62b87796cad9c91ea69486f1d7db067cfb58e0' 
  AND token = '3xVkHlaxxAOpFSte2gWx+IrQtOuvTa5P1WfhHAYDV8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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