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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8508f9b416f2d523222f074b525adf9c598aea74442d3b1d7972a8a350df14e9' 
  AND token = 'CLhrHsmNoFK8AnNC1WOQ+Ao0gp3AV2zUkSdZ0+BQlck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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