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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c654c7155cd6fee61e3e75e03ef9a6767485ebbb3c84d52469cfdabc0a279f0' 
  AND token = '3ShC0HskVJjefYXTFmcwj2akkqFuekpMlk+FZb0SZ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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