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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8ac69fe9c257151d4ab0762e187c7f274f3fbdf0096911c2e5a478b77661d1' 
  AND token = '2xEndvYmIqYVYF90iH3VfO6PJVxmv2DQqRMc8qNMMSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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