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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c37766e852d1d1bcc36e9f82c0cba4efa69a2b939f9b45268ea73234d68663' 
  AND token = 'H1Fta1IspBiaH792N0ZzFuQpiPxXkglL4/Ix/HEvKQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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