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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e8b71aa3566b7c07b2d45ce707e3ef46206467d26daba4249735c400269e64' 
  AND token = 'flztLZ6YfPMHuLg7QuDGqmrt02lG+38JzeWYY3BIwHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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