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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5e66688caacf1d867d027805aac445f7c76d5027f9b91bf8a413340c7a6be4' 
  AND token = '6wkLxA48m86JQ0knGSfv30kXOxcsJ1ZcQD1H55F1sEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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