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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2543dea59b2fa7f36aa60c200d4d2efc65ad438f0d91aa121c3221d491b238' 
  AND token = 'x2DpVUWqefJPg/s2r7gEOpLX2iw21iZil7f+mShLzzM=' 
  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"
    }
  }
}