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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d7aafbb1be5c35035487924baf1cad04d772f9371c2a6d3549452f31c3a5b8' 
  AND token = '/nhc/Ayvji9CWvwCYoMNR1ZCnnxCYNo+BlEwL8xSiE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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