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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b244a07a7ea777f7cf67bf4a9fe4bf20b4ca1ba292ce32de5f500e9b8e4e6352' 
  AND token = '/DpYSvzWRyy1irVBxSjFK3xINqJ2di1Vm93qEbmw2II=' 
  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"
    }
  }
}