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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0583d718929c9ee9c54a7fd87cf56776e3ec90d505a3dbf3005ef6550adba69f' 
  AND token = 'vBkA6OnYqCSq7W1e+QET/4cAr1aT9mhpvHgzUaG5S/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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