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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2fe1251e49ca7b5bb6210381bedb8133aab7c678d6c3b719e3b5dda109d4b9' 
  AND token = 'LpVDwOHfqAI1Wk+50hnfZVUaS6PswQEnoXT9vTHUIHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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