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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0720ed69b3eb713239662dff8a6471727736bb04e3d3a8c36aa0691b22d80e5f' 
  AND token = 'xIAELFWg+lMNYqSyI9I2S5w5cUPha6E3+x219DvfsM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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