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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813881a7d95ca020c4773117f1a1c2de07b71c0603925909b3088adf65da6a26' 
  AND token = 'UJMohDpiPEk75bqi/+OCrl3JRx8S8jV2eQonJKeVFWw=' 
  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"
    }
  }
}